Influence of accidental load on the effective power of gas-turbine and diesel engines being a part of soil cultivating units

The regularities of effective power change of gas-turbine engine (GTD-350T), constant power engine (D-260.4S2) and diesel engine (SMD-62), depending on external load and the coefficient of its variation are investigated. The comparative estimation of efficiency of these engines’ application on tractors in aggregate with soil cultivating machines is carried out; experimental data is received. The methods of mathematical modeling and probabilistic-statistical estimation of the operational parameters of soil cultivating units are applied. The dependencies of extreme values of effective power of abovementioned engines on the shaft torque and coefficient of load variation are obtained. The studies show that the piecewise-linear characteristic of constant power engines is more rational than the piecewise parabolic characteristic of diesel engines. The parabolic characteristic of gas-turbine engines is the most effective one and less sensitive to the fluctuations of external load. The application of gas-turbine engines on tractors meets the technical and technological requirements for agricultural machinery. The gas-turbine engines can improve the competitiveness of domestic tractors by 1.2-1.3 times, reduce the expenditure of labor by 15-20%, increase the productivity of labor on average by 18-22% compared with tractors equipped with diesel engines.

engine shaft torque, coefficient of flexibility, test-bench characteristic, effective power, gas-turbine engine, constant power engine, diesel engine, technological process, coefficient of load variatio